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All structured data in Wikidata is released under CC0 1.0, a public-domain dedication, which means you can reuse Wikidata statements, labels and descriptions for any purpose, commercially or not, without attribution or permission. The catch heritage practitioners must internalise is that CC0 covers the data only — images and media live on Wikimedia Commons under their own, often stricter, licences. Understanding where CC0 stops is the whole game.
What exactly does CC0 cover on Wikidata?
CC0 applies to everything in the structured-data layer of an item:
- Statements (property–value pairs) and their qualifiers and references.
- Labels, descriptions and aliases in every language.
- Sitelinks as data, and the full database dumps.
It does not cover linked media files, external pages you reference, or content on connected Wikipedias (which are CC BY-SA). The boundary is the item's data versus everything it merely points at.
Why does the data/media split matter so much?
It is the most common licensing mistake in heritage reuse: pulling an item and its depicted image and assuming both are CC0. The image is a separate Commons file that might be CC BY-SA, CC BY, or a non-free fair-use upload. Always resolve the file to Commons and read its own licence box.
| Asset | Where it lives | Typical licence |
|---|---|---|
| Statements, labels, refs | Wikidata item | CC0 1.0 |
| Database dumps | dumps.wikimedia.org | CC0 1.0 |
| Depicted image | Wikimedia Commons | varies (CC0 / CC BY / CC BY-SA / PD) |
| Linked Wikipedia text | Wikipedia | CC BY-SA |
Can I import my catalogue data into Wikidata?
Only if it is free to contribute under CC0. Bare facts (a birth date, a dimension, an accession number) are generally not copyrightable and are fine. But a substantial, creatively selected database may carry copyright or database rights; importing it wholesale without rights breaks the CC0 commitment and can be reverted. When in doubt, contribute facts, not bulk creative selections.
Should I attribute Wikidata even though I do not have to?
Legally CC0 requires no attribution. As scholarly best practice, cite it anyway — for reproducibility and integrity, not obligation. Record the query and access date:
text
Source: Wikidata (CC0 1.0). Query:
https://query.wikidata.org/#<encoded-SPARQL>
Accessed 2026-03-05.This makes your figures defensible across an entire collection even though the licence itself imposes nothing.
How does Wikidata's licence interact with my own?
Because CC0 has no copyleft, pulling Wikidata data imposes zero downstream obligations. You stay free to license your own collection metadata however you like — CC0, CC BY, a restrictive licence, anything. There is no viral effect forcing your data open. This makes Wikidata uniquely safe to mix into licensed datasets.
What is a defensible licensing checklist?
Run this before publishing any reuse:
text
[ ] Confirmed reused statements come from Wikidata (CC0) — OK to reuse
[ ] For every image: opened the Commons file and recorded ITS licence
[ ] Did not assume Commons media is CC0
[ ] If contributing: only facts or rights-cleared data, CC0-compatible
[ ] Cited the SPARQL query + access date (best practice, not required)
[ ] Documented per-asset licensing in the collection's rights notesPer-asset documentation is what keeps a whole collection consistent and audit-ready.
Key Takeaways
- Wikidata structured data is CC0 — reuse freely, no attribution required.
- Images are NOT covered: Commons media carry separate, often stricter licences.
- Database dumps are CC0 too, including database rights.
- Contribute only facts or rights-cleared data; do not dump copyrighted databases.
- CC0 has no copyleft, so it never constrains your own collection's licence.
- Cite the query and access date as scholarly best practice, even though CC0 does not demand it.
- Keep per-asset licensing notes so the whole collection stays defensible.
Frequently Asked Questions
What licence does Wikidata data use?
All structured data in Wikidata items is released under CC0 1.0, a public-domain dedication. That means anyone can reuse the data for any purpose without attribution or permission. The licence applies to the statements, labels, descriptions and aliases.
Can I contribute data I do not own to Wikidata?
Only if it is already free of copyright or you hold the rights and agree to CC0. Importing copyrighted databases or substantial copyrightable selections without rights violates the CC0 requirement and can be reverted. Facts themselves are generally not copyrightable.
Does CC0 mean I never have to attribute Wikidata?
Legally, no attribution is required under CC0. As scholarly best practice, however, you should still cite Wikidata and the specific query or items for reproducibility and academic integrity, even though it is not a licence obligation.
What about images shown on Wikidata items?
Images live on Wikimedia Commons, not in the Wikidata structured data, and carry their own separate licences (CC0, CC BY, CC BY-SA, public domain, etc.). The CC0 of Wikidata data does not extend to those media files — check each file's licence.
Is the Wikidata database as a whole CC0 too?
Yes. Both the individual data and the database dumps are released under CC0, so you can download, reprocess and redistribute full dumps without restriction, including the database-rights dimension that some jurisdictions recognise.
How does Wikidata licensing affect my own collection's licence?
Pulling CC0 data from Wikidata imposes no obligations on your collection, so you remain free to license your own data and metadata however you choose. CC0 is the most permissive option and creates no copyleft viral effect.